First share some directory on your PC and create some user with password. Sometimes on XP works also without password. Or just set password for your default windows user.

example:
user: johndoe
password: mypassword
IP adress of pc: 192.168.1.50 "you have to find your own ip adress"

go to folder that u would like to share and press RIGHT mouse button and click SHARE...
Then just enable sharing.
And write name for sharing: cuberevo "you may write something else"

go to mount manager:

Server type: CIFS(Windows)
Index: 1 to ??? whatever you want, but start with 1
Server IP: 192.168.1.50 "ip address of pc"
shared folder: cuberevo "write what u have written on PC"
server id: johndoe
server password: mypassword

then click to Connect and it should work.

Now you can watch movies, mp3, pictures from your PC hard drive